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1.48, in scientific notation is 1.48 but, if you really need to show that you have written it in scientific notation, you could write it as 1.48*100
It is 8.9*10^-5 in scientific notation
It is 6.58, as in the question. But you could write it as 6.58*10^0.
There is nothing to change. There is no reason to write 1.00054 in scientific notation. Technically, it could be written as 1.00054 × 100, but this is not normally done.
There's nothing to change here. There is no advantage or reason to write 7.2 in scientific notation. Technically, however, it could be written as 7.2 × 100, but this is not normally done.